Means for circulating a cooling medium in gas-actuated rock-drills.



PATENTBD MAR.` 5, 1907,

0. c. DURYBA. l MEANS FOR GIRGULATING A COLING MEDIUM IN GAS ACTUATBDROCK DRILLS..

APPLICATION FILED DEU.11.1905.

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4UNITED sTATEs PATENT OFFICE. I

OTHO C. DURYEA, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO NATIONAL GASDRILL CO., OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA.` p

MEANS FOR CIRCULATING A CCOLING 'MEDIUM IN GAS-ACTUATED ROCK-DRILLS.

F a/ZZ whom t may concern:

Beit known that I, OTHo XC. DURYEA, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles and State ofCalifornia, have invented a new and useful Means for Circulating aCooling Medium in Gas-Actuated Rock-Drills, ofwhich the following is aspecification.

The object of this invention is Ito provide a free-piston gas-actuatedrock-drill with cooling-fluid-circulating means arranged in effective,simple, compact, convenient, and durable form. A

The accompanying drawings illustrate the invention. l

Figure 1 is a side elevation of a free-piston gas-actuated drill inwhich this invention is applied. The piston is shown at the close of'itspump-actuating stroke. A fragment of the drill-steel is shown. Fig.2 isla fragmental axlal section on line m2, Fig. 3, the

. parts being in position at the close of the return stroke of the pump.The piston is not sectioned. Fig. 3 is a'frontfview with -the piston-rodof the drill in cross-section on line 113ml", Fig. 2.

1 designates 'a free-piston gas-actuated drill provided in its cylinder2 with a passage 3 for a medium for cooling the cylinder and alsorovided with a piston 4, having an ineline face in the form of a taperportion 5.

on its rod 6.

` 7 is a pump for circulating water or other cooling medium through saidpassage 3, and 8 designates pump-actuating means. in the form of apivoted bell-crank attached to the cylinder by means of a frame 9,screwed on the end of the cylinder 2. The bell-crank 8 is provided witha roller 1() to engage the taper portion 50i the piston-rod to therebybe actuated, said actuation being direct on the pumping stroke andthrough a spring on the Specification of Letters Patent.

Application led December 11, 1905. Serial No. 291.218.

y is actuated.

.the pump to the cylinder 2.

" Patenteamarch 5,1907.

attached. thereto; but it is to be, understood that the piston isprovided with a suitable head orheads (not shown) lby which said rod Inpracticalope'ration the taper portion of the reciprocating piston willoperate the bellcrank, thus operating the. pump-piston in one directionagainst the force of the spring 14, which returns the pump-piston as thedrill-piston moves to relieve the bell-crank.

15 indicates hose connections for returning the cooling medium to anddrawing it from a suitable tank 16. I

17 and 18 are respectively the receiving and discharging checks of thepump.

It is `to be understood that where the piston-rod carries thedrill-steel 19 and is rotated lor rotating the steel the slanting or in-20 designates a stud screwed into the cylinder 2 to act as a stop forthe check-valve 18 and as a guide for the check-spring 21.

22 designates bolts detachably securing Thepump-piston 11 is chambercdto receive the returnspring 14, and the stud. 23 for said spring isriveted in such piston.

WhatI claim is 1. In a gas-actuated rock-drill, a cylinder, a pump forcirculating a cooling medium therethrough, and a piston for saidcylinder provided with a taper portion for operating the pump. i

2, In a ofas-actuated rock-drill, the combination with a cylinder havinga passage for a cooling medium, of a pump-cylinder com- I do notmunicating with such passage, a piston for the pump-cylinder, means foractuating the same, and a piston for the rock-drill having a slantingface `for'operating said actuating 1o. and to operate the pump,

the slantcrank arranged to be operated by and yield;

the pump-piston in poi l for holding the .pump-piston in position for lengagement with the hellcrank.

ln testimony whereof I have hereunto set 1 my hand, at Los Angeles,California, this ist l day ol December, 1905.

oTHo o. nin-Heir l l f g In presence 0f l l JAMES R. TOWNSEND, l TILLIEE. ADAM.

